Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first embodiment of a display screen orportion thereof with transitional graphical user interface showing afirst image in a sequence, showing our new design;

FIG. 2 is a front view showing a second image thereof;

FIG. 3 is a front view showing a third image thereof;

FIG. 4 is a front view showing a fourth image thereof;

FIG. 5 is a front view of a second embodiment of a display screen orportion thereof with transitional graphical user interface showing afirst image in a sequence;

FIG. 6 is a front view showing a second image thereof;

FIG. 7 is a front view showing a third image thereof; and,

FIG. 8 is a front view showing a fourth image thereof.

The outermost perimeter illustrated by dashed broken lines representsdisplay screens or portions thereof and forms no part of the claimeddesign. The remaining dashed broken lines illustrating portions of thegraphical user interface form no part of the claimed design.

The appearance of the transitional graphical user interface sequentiallytransitions between the images shown in FIGS. 1-4 or FIGS. 5-8 . Theprocess or period in which one image transitions to another image formsno part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.